
Before anything else, one test tells you where the problem is: sign in to webmail and try sending from there.
If webmail works but your app doesn't
The mailbox is fine - the problem is in the app's settings. Almost always one of these three:
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If webmail doesn't work either
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Sending works, receiving doesn't
This is almost always DNS: the domain's MX records aren't pointing here. If you recently changed nameservers or use an external DNS provider, the mail is being delivered somewhere else. Check with how to check a domain's DNS.
Your messages arrive in the recipient's spam folder
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| Recently changed the DNS? Give it time before assuming a fault - see how long DNS changes take. During that window, some mail may still be delivered to the old server. |
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Tried all this and it still fails? Tell us the exact error message. Open a support ticket |
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SEE ALSO If messages leave but land in the recipient's spam: SPF, DKIM and DMARC: why your e-mail lands in spam. |
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More about e-mail
More articles on the same subject, for when this one is not enough.
- Setting an out-of-office reply (autoresponder) on a mailbox
- Adding a signature to your e-mails: webmail, computer and phone
- Mailing lists in cPanel: one address for a whole group
- Reading an e-mail header: did SPF, DKIM and DMARC pass?
- How to set up your e-mail in Apple Mail on a Mac
- Attachment too large: why the message bounces and how to send big files
- Your domain or IP is on a blacklist: how to check and how to get off it
- Google Workspace or Microsoft 365 on your own domain: MX records, and keeping your website with us
- Your logo beside your e-mails: what BIMI is and what it asks for
- Which e-mail addresses a business should create: role addresses and personal ones
- Other e-mail apps on your phone: Gmail, Samsung Email and Outlook, with the same settings
- Forwarded e-mail lands in spam or bounces: why SPF breaks and what to do
- Email Routing in cPanel: local, remote or automatic, and the mail that vanishes
- Read receipts and tracking pixels in e-mail: what they tell you and what they do not
- Autodiscover and autoconfig: how Outlook and your phone find the mailbox settings
- A new domain sending e-mail: how to build a reputation without landing in spam
IMAP, POP3 and SMTP in depth
- How an e-mail travels: SMTP to the MX server, then IMAP or POP to the reader
- Testing IMAP, POP3 and SMTP by hand with openssl s_client: a guide for technical users
- IMAP folders, flags and IDLE: how push e-mail works and why a folder lags behind
- POP3 and Leave a copy on the server: how it works and what goes wrong
- SMTP relay through a smarthost: sending mail from a VPS or from an application
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